Ternary Operator in PHP https://wpsites.net/php-code/code-php-using-ternary-operator-replacing-if-else-statement/

functions.php

add_action( 'loop_start', 'ternary_operator_method_three' );
function ternary_operator_method_three() {
$output = is_front_page() ? 'Only on the front page' : 'Otherwise different on all others';
echo $output;
}